NAVI D-25 Instruction Manual page 200

● Handling standard solution after use
● Storing standard solution
D-52/53/54/55
tested, the larger the errors that may occur in
calculation.
Standard solution that has been used should not be
returned to the original container. It should be discarded.
Standard solution must be stored in an air-tight container
and should be kept in a cool, dark place.
If standard solution is not stored in an air-tight container,
it will evaporate and become contaminated with
impurities, causing the concentration to change.
7 Reference
7.3 Ion measurement
189